Billing address not updated after change successfully submitted

To anyone following the thread, I would check again now (December 2023) to see if you can update the T-Mobile billing address. Even though "billing address" no longer applies in my case since I'm using the pre-paid cards, I was able to change it today.  Also it changed the e911 address to the same as the billing address (I don't know if they can be different, I left well enough alone and didn't experiment with that). 

Also, for those who need to use a post office box as their T-Mobile billing address (RV people, homeless, etc.), you can do it, but as I wrote before, the T-Mobile system will reject it if you try to put in for example  "PO Box 1234, Anytown, CA 54321."  What you have to do is go to the Post Office where your box is and apply for the "street addressing" option to be added to your PO Box (just need to sign a form - info on the USPS website).  In that case you are allowed to use the actual street address of the Post Office and your box number to get your bill.  The T-Mobile site will also accept this.  For example it would be like "123 Oak Street #1234, Anytown CA 54321," where 123 Oak Street is the street address of the Post Office where your box is and (the USPS clerk will tell you this address format for your box.)

 However, as I wrote, the T-Mobile system will automatically change your e911 address to that address also, so you have to check if you can separately change the e911 address to an actual physical address where you might be temporarily residing (RV park, friend's house, etc). You may not be able to do that (have to re-check what shows up for both addresses).  The system may require that the billing address and e911 address are the same - don't know, just have to try.   If it does allow this, obviously you'd want to change your e911 address for emergency service (police/fire/ambulance) to wherever you will be physically located.  In any case, whenever you call 911 from a cell phone, the FIRST you want to say is "I am at address XYZ, and my emergency is …..," in case you get cut off.  With a cell phone they can only locate you approximately with tower triangulation; they can't determine your exact location.